Pumps are the same as a 460 u. A piggy back set up. One is 12-17 GPM and the other is 3-4 GPM all bolted together. I believe though the small one on the end does the three point though. One filter is stock by the brakes. The tube that feeds the pump is notorious for leaks at the seal in the middle if not positioned correctly. Is the oil foamy? If so air leak. If you can find a 3000lb gauge and plumb it in on the ports for the pump by the clutch. It should be around 1800. Those tractors hydraulics are noisy until the oil is warmed up from past experience in the winter. From the wording this tractor has only one pump? I would have thought with a back hoe it would have a front pump or pto one also. If some one changed the main to a 17 it will cavitate because the factory filter is too small. There is a chance the flow control screen might be getting plugged. Does it sound like it is on high pressure? If so the control valves may be (to set double acting to single) may be in between the settings. So many things to look at. Too heavy of oil can cause problems . It should be Hytran which is a 20 weight. Filter, is it one oval filter or two doughnuts? If it is the two small round ones change it to the oval. Some thoughts.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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